package CollectionPart;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

public class SetTest {

    public List<Course> coursesToSelect;

    private Scanner console;

    public Student student;

    public SetTest() {
        coursesToSelect = new ArrayList<Course>();
        console = new Scanner(System.in);
    }

    /**
     * 用于往coursesToSelect中添加备选课程
     */
    public void testAdd() {
        //创建一个课程对象，并通过调用add方法，添加到备选课程List中
        Course cr1 = new Course("1", "数据结构");
        coursesToSelect.add(cr1);
        Course temp = (Course) coursesToSelect.get(0);
//		System.out.println("添加了课程：" + temp.id + ":" + temp.name);

        Course cr2 = new Course("2", "C语言");
        coursesToSelect.add(0, cr2);
        Course temp2 = (Course) coursesToSelect.get(0);
//		System.out.println("添加了课程：" + temp2.id + ":" + temp2.name);

//		coursesToSelect.add(cr1);
//		Course temp0 = (Course) coursesToSelect.get(2);
//		System.out.println("添加了课程：" + temp.id + ":" + temp.name);


        //以下方法会抛出数组下标越界异常
//		Course cr3 = new Course("3", "test");
//		coursesToSelect.add(4, cr3);

        Course[] course = {new Course("3", "离散数学"), new Course("4", "汇编语言")};
        coursesToSelect.addAll(Arrays.asList(course));
        Course temp3 = (Course) coursesToSelect.get(2);
        Course temp4 = (Course) coursesToSelect.get(3);

//		System.out.println("添加了两门课程：" + temp3.id + ":" +
//				temp3.name + ";" + temp4.id + ":" + temp4.name);

        Course[] course2 = {new Course("5", "高等数学"), new Course("6", "大学英语")};
        coursesToSelect.addAll(2, Arrays.asList(course2));
        Course temp5 = (Course) coursesToSelect.get(2);
        Course temp6 = (Course) coursesToSelect.get(3);
//		System.out.println("添加了两门课程：" + temp5.id + ":" +
//				temp5.name + ";" + temp6.id + ":" + temp6.name);

    }

    /**
     * 通过for each方法访问集合元素
     *
     * @param args
     */
    public void testForEach() {
        System.out.println("有如下课程待选(通过for each访问)：");
        for (Object obj : coursesToSelect) {
            Course cr = (Course) obj;
            System.out.println("课程：" + cr.id + ":" + cr.name);
        }
    }

    /**
     * 测试List的contains方法
     */
    public void testListContains() {
        // 取得备选课程序列的第0个元素
        Course course = coursesToSelect.get(0);
        // 打印输出coursesToSelected是否包含course对象
        System.out.println("取得课程：" + course.name);
        System.out.println("备选课程中是否包含课程：" + course.name + ", " +
                coursesToSelect.contains(course));
        // 提示输入课程名称
        System.out.println("请输入课程名称：");
        String name = console.next();
        // 创建一个新的课程对象，ID和名称，与course对象完全一样
        Course course2 = new Course();
        course2.name = name;
        System.out.println("新创建课程：" + course2.name);
        System.out.println("备选课程中是否包含课程：" + course2.name + ", " +
                coursesToSelect.contains(course2));
        // 通过indexOf方法来取得某元素的索引位置
        if (coursesToSelect.contains(course2))
            System.out.println("课程：" + course2.name + "的索引位置为：" +
                    coursesToSelect.indexOf(course2));
    }

    // 创建学生对象并选课
    public void createStudentAndSelectCours() {
        //创建一个学生对象
        student = new Student("1", "小明");
        System.out.println("欢迎学生：" + student.name + "选课！");
        //创建一个Scanner对象，用来接收从键盘输入的课程ID
        Scanner console = new Scanner(System.in);

        for (int i = 0; i < 3; i++) {
            System.out.println("请输入课程ID");
            String courseId = console.next();
            for (Course cr : coursesToSelect) {
                if (cr.id.equals(courseId)) {
                    student.courses.add(cr);
                    /**
                     * Set中，添加某个对象，无论添加多少次，
                     * 最终只会保留一个该对象（的引用），
                     * 并且，保留的是第一次添加的那一个
                     */
//					student.courses.add(null);
//					student.courses.add(cr);
                }
            }
        }
    }

    /**
     * 测试Set的contains方法
     */
    public void testSetContains() {
        // 提示输入课程名称
        System.out.println("请输入学生已选的课程名称：");
        String name = console.next();
        // 创建一个新的课程对象，ID和名称，与course对象完全一样
        Course course2 = new Course();
        course2.name = name;
        System.out.println("新创建课程：" + course2.name);
        System.out.println("备选课程中是否包含课程：" + course2.name + ", " +
                student.courses.contains(course2));
    }

    /**
     * @param args
     */
    public static void main( String[] args ) {
        SetTest st = new SetTest();
        st.testAdd();
        st.testListContains();
        st.testForEach();

//		st.createStudentAndSelectCours();
//		st.testSetContains();
//
//		st.testForEachForSet(student);
    }

    public void testForEachForSet( Student student ) {
        //打印输出，学生所选的课程！
        System.out.println("共选择了：" + student.courses.size() + "门课程！");
        for (Course cr : student.courses) {
            System.out.println("选择了课程：" + cr.id + ":" + cr.name);
        }
    }

}
